Malicious PDF — malware analysis report

Static analysis result for SHA-256 747f578bc33b53f9…

MALICIOUS

PDF

48.4 KB Created: 2020-03-12 14:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 646c7bf599d049e5d031b9ef7ca60e89 SHA-1: 2de2a2089ab9916ddff27bbfe5a14dfc646a6305 SHA-256: 747f578bc33b53f91af0138d967b1572656948bec7b7118ba9ea501053956cff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous external links, suggesting a link farm or redirection scheme designed to lead users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of many embedded URLs points towards an attempt to direct users to external resources, likely for phishing or malware distribution. The document body text, though partially obfuscated, mentions 'Nephrogenic diabetes insipidus pdf', which appears to be a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://x0226529xstreamtravel.xsideas.com/uploads/1/3/0/7/130775400/130775400.html#nephrogenic+diabetes+insipidus+pdf
    • http://erinferree.com/uploads/1/3/0/5/130550684/zolux-rugaw.pdf
    • http://md.chat/uploads/1/3/0/5/130543771/pokobupa.pdf
    • http://rindates.com/uploads/1/3/0/9/130969878/700cf0eefdfda.pdf
    • http://metroeastinterfaith.com/uploads/1/3/0/6/130603865/8851918.pdf
    • http://wendoverconsultants.com/uploads/1/3/0/6/130604582/9aa27c.pdf
    • http://xgens.org/uploads/1/3/0/2/130270792/fisojonujuti.pdf
    • http://adsl-67-65-143-61.amcirealestate.com/uploads/1/3/0/8/130873954/f40b7ccf9f56.pdf
    • http://grand-fruits.com/uploads/1/3/0/4/130435741/4602886.pdf
    • http://fidesrepunte.us/uploads/1/3/0/4/130483443/8822207.pdf
    • http://linden58.pleasingfood.com/uploads/1/3/0/5/130551562/kisamifuxofike.pdf
    • http://price-loto.site/uploads/1/3/0/4/130476158/932d8a5a7c05638.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009353.bin
78b01d393243cb409936e1458e9744487a599684c1e5975a58f635a8e6edc45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9353 8900 bytes

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